Check your fuel pump
The problem could be that your flasher switch is going out. I had the same problem on my 99 blazer. It sounded like a bee buzzing in my dashboard. Had the switch replaced and problem was gone. Hope this helps.
A humming bird
near the fuse box, under the dash on the drivers side (left side) when you turn on your blinkers its where the "blink" sound comes from.
The word is droning. It means to make a continuous low humming sound.
purring?
1. a low humming sound (noun) 2. a male bee (noun)
the ticking is the blinkers
Possibly worn wheel bearings can create a humming or groaning sound.
Its the sound telling you need new taps
I have a whirring sound in my ears Can you tell me what is causing it?
I wonder if your a/c compressor is going on the blink? If you can disconnect it somehow, does the humming stop?